State profile · Near median Poor share

New Hampshire bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in New Hampshire.

2,542
Public bridges
51.6%
Good condition
7.5%
Poor condition

New Hampshire holds 2,542 public highway bridges (#44 of 52 by inventory) with a 7.51% Poor share (#18 of 52 by Poor share).

That is 7.5% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 35 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

2,542

Public highway bridges in New Hampshire

Good Condition

51.6%

1,312 bridges rated 7-9

1.6pp vs 50% benchmark

Poor Condition

7.5%

191 bridges whose lowest applicable component is rated 0-4

-0.0pp vs national avg 7.5%

New Hampshire vs national bridge condition

New Hampshire - Good condition share 51.6%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

New Hampshire - Poor-condition share 25.0%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

New Hampshire in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

New Hampshire vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

2,542 44th of 54 higher than 10 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for New Hampshire

The highlighted point is New Hampshire: 2,542 bridges and 7.51% in Poor condition, rank #35 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below New Hampshire on that same Poor-share ordering:

  • Montana: 5,224 bridges · 6.81% Poor
  • Kentucky: 14,548 bridges · 7.37% Poor
  • New Hampshire: 2,542 bridges · 7.51% Poor
  • Oklahoma: 22,917 bridges · 7.70% Poor
  • Alaska: 1,685 bridges · 7.89% Poor

The full national sortable table lives on the rankings page.

Material families in New Hampshire

Exclusive FHWA material families across all 2,542 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains New Hampshire’s inventory

State agency holds 58.0% of the 2,542 public highway bridges filed under New Hampshire in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When New Hampshire’s bridges were built

Pre-1950 construction accounts for 26.2% of the 2,542 bridges with a recorded original year in New Hampshire. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

New Hampshire51.6%40.9%GoodFairPoor
Bridge inventory deck-condition mix - New Hampshire (FHWA NBI)

Counties (10)

Belknap 112 Carroll 193 Cheshire 192 Coos 188 Grafton 544 Hillsborough 385 Merrimack 326 Rockingham 308 Strafford 136 Sullivan 158

New Hampshire vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below New Hampshire on the same metric.

MT

Montana

6.81% top marginal rate
Structure
Progressive
Burden @ $100K
$5,224

KY

Kentucky

7.37% top marginal rate
Structure
Progressive
Burden @ $100K
$14,548
Selected

NH

New Hampshire

7.51% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

OK

Oklahoma

7.70% top marginal rate
Structure
Progressive
Burden @ $100K
$22,917

AK

Alaska

7.89% top marginal rate
Structure
Progressive
Burden @ $100K
$1,685

Bridges Needing Most Attention in New Hampshire

Six lowest-condition bridges in New Hampshire, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

THORNTONS FERRY RD

Poor

Over: BEAVER BROOK

3.2 MI FR MERRIMACK TL, Hillsborough, NH

Built 1970 Load: 0.0 t ADT: 388

GRIST MILL HILL RD

Poor

Over: INDIAN RIVER

2.01 MI FROM GRAFTON TL, Grafton, NH

Built 1956 Load: 0.0 t ADT: 404

GRANITE ROAD

Poor

Over: SOUTH RIVER

0.3MI. RTE 153, Carroll, NH

Built 1920 Load: 0.0 t ADT: 90

OLD COUNTY RD N

Poor

Over: COLLINS BROOK

2.4 MI. DEERING TL, Hillsborough, NH

Built 1981 Load: 0.0 t ADT: 90

SOUTH ROAD

Poor

Over: MINNEWAWA BROOK

0.9 MI FR DUBLIN TL, Cheshire, NH

Built 1950 Load: 0.0 t ADT: 90

STEARNS BROOK ROAD

Poor

Over: STEARNS BROOK

0.4 MI FR SUCCESS TL, Coos, NH

Built 1950 Load: 0.0 t ADT: 90

All Bridges in New Hampshire

VALLEY ROAD

Good

Over: S BRANCH ISRAEL RIVER

0.84 MI S JCT US 2, Coos, NH

Built 1979 Load: 45.3 t ADT: 90

I-93 PARKWAY

Good

Over: PED UNDERPASS

7.4MI NO WOODSTOCK T.L., Grafton, NH

Built 1985 Load: 45.3 t ADT: 11,427

ASH STREET

Good

Over: I-93

0.7 MI N JCT NH 102, Rockingham, NH

Built 2019 Load: 45.3 t ADT: 7,135

FEE TPK SB RAMP

Good

Over: FEE TPK SB OFF RAMPS

1.2 MI N MASS SL, Hillsborough, NH

Built 1996 Load: 45.3 t ADT: 50,683

DANA HILL ROAD

Good

Over: NHRR

450 FEET FR WINONA ROAD, Belknap, NH

Built 1998 Load: 45.3 t ADT: 467

US302

Good

Over: ROCKY BRANCH RIVER

1.1 MI. FROM JCT. NH 16, Carroll, NH

Built 1990 Load: 45.4 t ADT: 6,003

CENTRAL STREET

Good

Over: PEMIGEWASSET RIVER

AT NEW HAMPTON TL, Grafton, NH

Built 2009 Load: 45.4 t ADT: 690

PILLSBURY STREET

Good

Over: MASCOMA RIVER

0.2 MI FR SCHOOL ST, Grafton, NH

Built 1930 Load: 45.4 t ADT: 533

NH 87

Good

Over: LAMPREY RIVER

1.2 MI. SE JCT NH 125, Rockingham, NH

Built 2004 Load: 45.4 t ADT: 2,629

CROSS MILL ROAD

Good

Over: WINNIPESAUKEE RIVER

AT NORTHFIELD-FRANKLIN T, Merrimack, NH

Built 1988 Load: 45.4 t ADT: 2,550

NH 16

Good

Over: ELLIS RIVER

0.5 MI FROM BARTLETT TL, Carroll, NH

Built 1938 Load: 45.4 t ADT: 7,181

NH120

Good

Over: I-89

.7MI FROM JCT RTE 4, Grafton, NH

Built 1966 Load: 45.4 t ADT: 11,305

I-93 NB

Good

Over: HANSON BROOK

1.9 MI NORTH WOODSTOCK T, Grafton, NH

Built 1985 Load: 45.4 t ADT: 5,814

WIRE ROAD

Good

Over: BABOOSIC BROOK

0.3 MI FR BEDFORD TL, Hillsborough, NH

Built 2013 Load: 45.4 t ADT: 2,355

US 3 FEE TPK SB

Good

Over: CANAL SERVICE ROAD

0.5 MI FROM NH 130, Hillsborough, NH

Built 1959 Load: 45.4 t ADT: 56,671

GULF ROAD

Good

Over: OTTER BROOK

0.12 MI FROM NH RTE 136, Hillsborough, NH

Built 1940 Load: 45.4 t ADT: 166

NH123A

Good

Over: COLD RIVER

.42 MI. FROM LANGDON TL, Sullivan, NH

Built 1961 Load: 45.5 t ADT: 1,214

NH123A

Good

Over: COLD RIVER

4.16 MI. FROM LANGDON TL, Sullivan, NH

Built 1961 Load: 45.5 t ADT: 411

NH 27(EXETER RD)

Good

Over: CSX(ABD)

3.8 MI E. EXET-HAMP T.L., Rockingham, NH

Built 1926 Load: 45.5 t ADT: 10,849

MURDOUGH HILL ROAD

Good

Over: NH 9

1.6 MI EAST SULLIVAN TL, Cheshire, NH

Built 1994 Load: 45.5 t ADT: 284

OAK STREET

Good

Over: SUGAR RIVER

0.4 MI FR NO. NEWPORT RD, Sullivan, NH

Built 2019 Load: 45.5 t ADT: 640

ISLINGTON STREET

Good

Over: US 1 BYPASS

1.0 MI FROM JCT US 1, Rockingham, NH

Built 2015 Load: 45.5 t ADT: 4,729

HENRY BRIDGE ROAD

Good

Over: HARRY BROOK

TOWN RD, Hillsborough, NH

Built 2008 Load: 45.6 t ADT: 6,725

BLUFF STREET EXT

Good

Over: WIDOW HARRIS BROOK

500 FEET FROM TOWN FARM R, Rockingham, NH

Built 2020 Load: 45.6 t ADT: 3,511

US 3

Good

Over: SOUCOOK RIVER

PEMBROKE T.L., Merrimack, NH

Built 1953 Load: 45.7 t ADT: 12,820

NH 27

Good

Over: NH101

JCT NH 27/NH101, Rockingham, NH

Built 1999 Load: 45.7 t ADT: 11,517

NH 18

Good

Over: I-93 PARKWAY

3 MI.N LINCOLN TL, Grafton, NH

Built 1986 Load: 45.7 t ADT: 578

MILL STREET

Good

Over: AMMONOOSUC RAIL TRAIL

0.15 MI FR MONT BELLO ST, Grafton, NH

Built 2018 Load: 45.7 t ADT: 87

NH125

Good

Over: CSX

.8 MI FROM JCT NH121, Rockingham, NH

Built 1992 Load: 45.7 t ADT: 22,573

NH 33

Good

Over: US 1 BYPASS

0.6MI FROM JCT RT 1, Rockingham, NH

Built 2013 Load: 45.7 t ADT: 6,321

STARK STREET

Good

Over: US 1 BYPASS

0.2 MI FROM JCT NH 16, Rockingham, NH

Built 2019 Load: 45.7 t ADT: 74

I-93 ON RAMPS

Good

Over: SOUTH POLICY STREET

0.25MI S. OF JCT RT 38, Rockingham, NH

Built 1960 Load: 45.7 t ADT: 18,765

I-93 SB OFF RAMP

Good

Over: SOUTH POLICY STREET

0.25MI S. OF JCT RT 38, Rockingham, NH

Built 1965 Load: 45.7 t ADT: 3,774

I-93 NB OFF RAMP

Good

Over: SOUTH POLICY STREET

0.25MI S. OF JCT RT 38, Rockingham, NH

Built 1961 Load: 45.7 t ADT: 14,960

GOODWIN ROAD

Good

Over: GUNSTOCK RIVER

0.4 MI FR HOYT ROAD, Belknap, NH

Built 1940 Load: 45.9 t ADT: 317

NH 16 SP TPK

Good

Over: US202

.6 MI FROM JCT RT 202A, Strafford, NH

Built 2011 Load: 45.9 t ADT: 54,657

NH 10

Good

Over: ASHUELOT RIVER

0.2 MI FROM SWANZEY TL, Cheshire, NH

Built 2014 Load: 45.9 t ADT: 7,174

BEDFORD ROAD

Good

Over: BABOOSIC BROOK

0.7 MI FR BEDFORD TL, Hillsborough, NH

Built 2008 Load: 46.0 t ADT: 2,319

MAGAZINE STREET

Good

Over: RIDDLE BROOK

0.2 MI FROM JCKSN SQ, Hillsborough, NH

Built 2013 Load: 46.1 t ADT: 538

MAIN STREET

Good

Over: SUNCOOK RIVER

ALLENSTOWN TL, Merrimack, NH

Built 2005 Load: 46.1 t ADT: 4,191

NH 16 SB

Good

Over: DEAD RIVER

1.5 MI N OF GORHAM TL, Coos, NH

Built 1931 Load: 46.2 t ADT: 4,199

NH 26

Good

Over: MOHAWK RIVER

2 MI W DIXVILLE TL, Coos, NH

Built 2007 Load: 46.2 t ADT: 917

WASHINGTON STREET

Good

Over: COCHECO RIVER

0.1 MI S NH 9, Strafford, NH

Built 2010 Load: 46.2 t ADT: 528

I-93 SB

Good

Over: SKOOKUMCHUCK BROOK

4 MI N LINCOLN T.L., Grafton, NH

Built 1987 Load: 46.2 t ADT: 5,017

NH 1A

Good

Over: RYE HARBOR

2.7 MI FROM N HAMPTON TL, Rockingham, NH

Built 1986 Load: 46.2 t ADT: 2,678

US 4

Good

Over: CRYSTAL LAKE BROOK

0.6 MI FROM ENFIELD TL, Grafton, NH

Built 1941 Load: 46.3 t ADT: 7,483

I-89 NB

Good

Over: PINE STREET

3.2 MI EAST OF WARNER T.L, Merrimack, NH

Built 1967 Load: 46.3 t ADT: 11,367

BREEZY HILL ROAD

Good

Over: WARNER RIVER

1.8 MI FROM WARNER TL, Merrimack, NH

Built 2016 Load: 46.4 t ADT: 90

HOYT ROAD

Good

Over: GUNSTOCK RIVER

2.5 MI FROM GUNSTOCK HIL, Belknap, NH

Built 2007 Load: 46.4 t ADT: 578

LYNDEBOROUGH ROAD

Good

Over: MEADOW BROOK

.2 NORTH OF 084/077, Hillsborough, NH

Built 2023 Load: 46.4 t ADT: 422

Showing 1,801-1,850 of 2,542 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.

What to do with this

Use New Hampshire's inventory picture to drill to a county or a specific span.

  • Browse counties in New Hampshire and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. New Hampshire Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.